Rory Culkin Welcomes First Baby with Girlfriend Kate Arizmendi as She Shares First Glimpses of Daughter Havoc Moon

The Culkin family just got a little bigger! The couple quietly welcomed their first child together before Arizmendi shared the news with a series of candid and emotional social media posts that quickly caught fans' attention.

Rory Culkin is officially a father. The actor and his girlfriend, cinematographer Kate Arizmendi, recently welcomed their first child together, with the couple sharing the news through intimate glimpses from the hospital.

Rory Culkin and Kate Arizmendi Announce Birth of Daughter Havoc Moon

Arizmendi, 38, revealed that the couple's daughter was born on Saturday, May 23, 2026. In one of the posts, the newborn could be seen sleeping peacefully while wrapped in a blanket shortly after birth. Arizmendi joked in the caption:

"Her in the womb while I'm screaming System of a Down. We're so in love with you."

A second photo showed baby Havoc wide awake in her hospital bassinet just minutes after delivery. Arizmendi appeared amused by her daughter's alert expression, writing that the baby was already "so alert and excited about life" only 15 minutes after being born.

She also playfully addressed the child directly in the caption, adding, "Also hello girl baby Rory." The couple confirmed their daughter's full name as Havoc Moon Alva Culkin.

The Couple Shared Their Pregnancy News Earlier This Year

Arizmendi first revealed her pregnancy in January with a heartfelt Instagram post reflecting on the emotional state of the world and her excitement about becoming a mother.

"My feed (and brain) has been consumed with such negativity and pain in the world that I thought I'd bring some light by announcing how ridiculously excited we are to be living in Havoc's world in a few months," she wrote at the time.

The post included several personal moments from the pregnancy, including a sonogram image and photos of Culkin reading to Arizmendi's baby bump. After giving birth, she updated the caption to include another emotional message about their daughter. The cinematographer added:

"We love her. She rules us already."

Culkin, 36, and Arizmendi reportedly began dating in 2023. While the actor tends to keep his romantic life private, the pair occasionally shared glimpses of their relationship online throughout the pregnancy. Arizmendi is known for her work behind the camera on projects including "Succession" and "Swallow."

Havoc Moon Joins the Expanding Culkin Family

The arrival of Culkin's daughter added another member to the famous Culkin family, which has grown significantly in recent years. The actor is the youngest of the Culkin siblings, who include brothers Macaulay Culkin and Oscar winner Kieran Culkin.

Both brothers are already fathers themselves. Macaulay shares two sons — Dakota and Carson — with wife Brenda Song. Meanwhile, Kieran and his wife, Jazz Charton, share three children together: daughter Kinsey Sioux, son Wilder Wolf, and a third child who arrived in late 2025.

Before his relationship with Arizmendi, Culkin was married to Sarah Scrivener, whom he met while working on "Scream 4." Now, the actor has stepped into a new role alongside his growing family: fatherhood.